Genealogy Queries by surname - Self

I had always been told that our family had native american ancestors so it was not a shock when I started working on my genealogy that I came across my 6th Great Grandmother -Catherine “Rising Fawn” Moytoy. She married William Presley Self in 1751 and had my 5th Great Grandfather, Issac Self in 1759. I

Looking for information on my family genealogy. I’ve traced back several generations but am unable to determine where the Cherokee heritage actually lies. I was told my great-grandmother’s mother was full blooded Cherokee, named Harriet Jane Self, later married to Charley Sparks. She was born in 1888 in Newton County, Arkansas.

I hope I can get some much needed help. My Grandmother’s Grandmother was Elizabeth Nelson born about 1830 in Blount County Alabama she married William Wesley Self. She was full blood Cherokee. I would like to know who her parents were and any siblings she may have had and any other information I can get

Is there a document or record proving the marriage between William Presley Self (1732-1812) and Catharine Ghi-Go-Ne-Li Rising Fawn Moytoy (1730-1800)? (Any other proof of her relationship to her tribe would be wonderful) Rising Fawn was also allegedly married to Ghi Go Ne Li Bushyhead.